/*
* Copyright 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.uibinder.elementparsers;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.uibinder.elementparsers.HtmlMessageInterpreter.PlaceholderInterpreterProvider;
import com.google.gwt.uibinder.rebind.UiBinderWriter;
import com.google.gwt.uibinder.rebind.XMLElement;
import com.google.gwt.uibinder.rebind.messages.MessageWriter;
import com.google.gwt.uibinder.rebind.messages.PlaceholderInterpreter;
/**
* Parses {@link com.google.gwt.user.client.ui.HTMLPanel} widgets.
*/
public class HTMLPanelParser implements ElementParser {
public void parse(XMLElement elem, String fieldName, JClassType type,
final UiBinderWriter writer) throws UnableToCompleteException {
/*
* Gathers up elements that indicate nested widgets (but only those that are
* not inside msg elements).
*/
WidgetInterpreter widgetInterpreter = new WidgetInterpreter(fieldName,
writer);
/*
* Handles non-widget elements like msg, and dom elements with ui:field
* attributes. There may be widgets inside a msg, which is why the
* construction in makeHtmlInterpreter is so complicated.
*/
HtmlInterpreter htmlInterpreter = makeHtmlInterpreter(fieldName, writer);
writer.beginAttachedSection(fieldName + ".getElement()");
String html = elem.consumeInnerHtml(InterpreterPipe.newPipe(
widgetInterpreter, htmlInterpreter));
writer.endAttachedSection();
/*
* HTMLPanel has no no-arg ctor, so we have to generate our own, using the
* element's innerHTML and perhaps its tag attribute. Do this in a way that
* will not break subclasses if they happen to have the same constructor
* signature (by passing in type).
*/
String customTag = elem.consumeStringAttribute("tag", null);
if (null == customTag) {
writer.setFieldInitializerAsConstructor(fieldName, type, writer.declareTemplateCall(html));
} else {
writer.setFieldInitializerAsConstructor(fieldName, type, customTag,
writer.declareTemplateCall(html));
}
}
/**
* Creates an HtmlInterpreter with our specialized placeholder interpreter,
* which will allow widget instances to be declared inside of ui:msg elements.
*/
private HtmlInterpreter makeHtmlInterpreter(final String fieldName,
final UiBinderWriter uiWriter) {
final String ancestorExpression = fieldName + ".getElement()";
PlaceholderInterpreterProvider placeholderInterpreterProvider = new PlaceholderInterpreterProvider() {
public PlaceholderInterpreter get(MessageWriter message) {
return new WidgetPlaceholderInterpreter(fieldName, uiWriter, message,
ancestorExpression);
}
};
HtmlInterpreter htmlInterpreter = new HtmlInterpreter(uiWriter,
ancestorExpression, new HtmlMessageInterpreter(uiWriter,
placeholderInterpreterProvider));
return htmlInterpreter;
}
}